I thought i'd best post this as a seperate topic to my other question, as it's a bit more involved and i'd be really keen to hear from other NakedDSL users.

I have a monthly data cap of 6gigs, and don't automatically purchase any extra blocks of data. however i routinely run out before the end of the month so use their website to buy an extra 3 or 10 gigs of data access.

According to the slingshot website, on nakedDSL i don't have to pay for the dial up speed data beyond the 6gigs (as below c+p from slingshot.co.nz)

"SPEED LIMITING - Have your plan speed reduced to dial up and you will not have to pay an extra penny. You can still choose to buy additional data if you wish."

BUT... every time i purchase a block of data, the information page updates, to say i've used 6.7gigs or whatever of a now available 9gigs or 16gigs. So how is it that i'm penalised anywhere from 300megs to 900megs every time i purchase a block of extra data?

If i wasn't been charged (...will not have to pay an extra penny) for anything over my allocated 6gigs, how come my freshly purchased data takes an instant hit every time?

Has anyone else noticed this happening?